1. Schultz, A., Zbl. Allg. Path. Pathol. Anat., 35, 314 (1924–25).
2. Grundland, I., Bulliard, H., and Maillet, M., C.R. Soc. Biol., Paris, 143, 771 (1949).
3. Pearse, A. G. E., Histochemistry, second edit., 321 (Churchill, London, 1960).
4. Klyne, W., The Chemistry of the Steroids, 112 (Methuen, London, 1957).
5. Lange, W., Folzenlogen, R. G., and Kolp, D. G., J. Amer. Chem. Soc., 71, 1733 (1949).